The Cisco Infrastructure group is for the discussion of technical issues that arise during the implementation, administration, or daily use of Cisco networking products such as WAN, LAN, Switching, Routing, and Network Management.

Source Loop Back Interface with GNS3

I am preparing CCNP routing, I have made lab in GNS3, for EIGRP over framerelay

When I try to ping the loop back address of 2nd spoke router R3 from 1st Spoke R2 it works only if I use ping 10.3.1.1 source loop1001
i am using below version of ISO
Cisco IOS Software, 7200 Software (C7200-IK9S-M), Version 12.4(13b), RELEASE SOF

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